but to give you a sense of the mood in connecticut, earlier today police in the city of ridgefield ordered schools on lockdown because of unspecified, quote, incident. they gave the green light to be open with a police presence remaining in each place at school. ridgefield is 20 miles away from newtown. a lot of folks on edge today. >>> roughly 5:00 p.m. this evening two nasa spaceships will crash head long into the moon, on purpose. trace gallagher explains why. trace? >> reporter:, well the fireworks, megyn because they both ran out of gas, right? that's why they have to be crashed. these two orbiters, twin orbiters will hit impact about 5:28 east coast time tonight. they will continue mapping the moon. they're going out with a fight, mapping the moon until the moment of impact. that will happen about 30 seconds apart and they will crash at an estimated 3700 miles per hour. these orbiters by the way were launched back in september of 2011. they spent more than a year going around and mapping the moon's craters and gravity force field, checking out the moon's density which is fascinating